It depends which series. Series 1 are like EB-D 5ltrs, they have the restrictive HO intake and E7 heads. Series 2 had the explorer manifold (much better) but still retained the E7 heads.

If you can get your hands on a EL2 Xr8 explorer manifold, you'll be laughing! Then you could either port the crap outta the E7's or spend 1k on a set of GT40P's from Herrods. The GT40P's are much better flowing in standard form than the E7's will ever be in ported form. IMO, you should go the GT40P's as the cost for porting the E7's will probably come out not much cheaper.

I have also heard that the 40P's can be further ported for bigger potential.

You could get the 40Ps from an engine importer as well. I see them in the parts peddler here in NSW from time to time. But if your handy and can follow instructions, you could port the E7s yourself. Thats what I'm going to do within the next 6 months or so with before and after figures on the dyno. But if you are not confident about doing the port work yourself, then the 40Ps will be a better proposition.

The intake is more restrictive than the heads, but it is close. Also fully ported E7's flow about as much as the stock GT40P's, that's why I went for the GT40P's in the first place. The GT40P's can also be further ported, I am doing mine this week. As for intakes, anything from ford with the GT40 base (Explorer, cobra or GT40) would be a good upgrade or just go for aftermarket edelbrock or trickflow ones.

It depends which series. Series 1 are like EB-D 5ltrs, they have the restrictive HO intake and E7 heads. Series 2 had the explorer manifold (much better) but still retained the E7 heads.

If you can get your hands on a EL2 Xr8 explorer manifold, you'll be laughing! Then you could either port the crap outta the E7's or spend 1k on a set of GT40P's from Herrods. The GT40P's are much better flowing in standard form than the E7's will ever be in ported form. IMO, you should go the GT40P's as the cost for porting the E7's will probably come out not much cheaper.

I have also heard that the 40P's can be further ported for bigger potential.

Just my 2c

You can't really get a better answer than that!

If you let us know some more details about why your asking (i.e. Have an EL1XR8 and want more go, or want to know which EL to buy etc etc), we can give you some more specific advice . . .